具有示例的C ++ STL向量迭代器
C++STL矢量迭代器
以下是C++STL中的迭代器（公共成员函数），可用于访问元素，
C++STL程序演示矢量迭代器的示例
//C++STL程序演示示例
//向量迭代器
#include <iostream>
#include <vector>
using namespace std;
int main(){
vector<int> v1;
v1.push_back(10);
v1.push_back(20);
v1.push_back(30);
v1.push_back(40);
v1.push_back(50);
//begin()和end()函数
vector<int>::iterator it;
it = v1.begin();
cout << "first element is: " << *it << endl;
it = v1.end()-1;
cout << "last element is: " << *it << endl;
//rbegin()和rend()函数
vector<int>::reverse_iterator rit;
rit = v1.rbegin();
cout << "first element (from reverse) is: " << *rit << endl;
rit = v1.rend()-1;
cout << "last element (from reverse) is: " << *rit << endl;
//cbegin()和cend()函数
vector<int>::const_iterator cit;
cit = v1.cbegin();
cout << "first element is: " << *cit << endl;
cit = v1.cend()-1;
cout << "last element is: " << *cit << endl;
//crbegin()和crend()功能
vector<int>::const_reverse_iterator crit;
crit = v1.crbegin();
cout << "first element (from reverse) is: " << *crit << endl;
crit = v1.crend()-1;
cout << "last element (from reverse) is: " << *crit << endl;
return 0;
}输出结果
first element is: 10 last element is: 50 first element (from reverse) is: 50 last element (from reverse) is: 10 first element is: 10 last element is: 50 first element (from reverse) is: 50 last element (from reverse) is: 10